Add comprehensive tests for playlist service and refactor socket service tests

- Introduced a new test suite for the PlaylistService covering various functionalities including creation, retrieval, updating, and deletion of playlists.
- Added tests for handling sounds within playlists, ensuring correct behavior when adding/removing sounds and managing current playlists.
- Refactored socket service tests for improved readability by adjusting function signatures.
- Cleaned up unnecessary whitespace in sound normalizer and sound scanner tests for consistency.
- Enhanced audio utility tests to ensure accurate hash and size calculations, including edge cases for nonexistent files.
- Removed redundant blank lines in cookie utility tests for cleaner code.

tests/api/v1/test_socket_endpoints.py

@@ -22,7 +22,12 @@ class TestSocketEndpoints:
     """Test socket API endpoints."""
 
     @pytest.mark.asyncio
-    async def test_get_socket_status_authenticated(self, authenticated_client: AsyncClient, authenticated_user: User, mock_socket_manager):
+    async def test_get_socket_status_authenticated(
+        self,
+        authenticated_client: AsyncClient,
+        authenticated_user: User,
+        mock_socket_manager,
+    ):
         """Test getting socket status for authenticated user."""
         response = await authenticated_client.get("/api/v1/socket/status")
 
@@ -43,7 +48,12 @@ class TestSocketEndpoints:
         assert response.status_code == 401
 
     @pytest.mark.asyncio
-    async def test_send_message_to_user_success(self, authenticated_client: AsyncClient, authenticated_user: User, mock_socket_manager):
+    async def test_send_message_to_user_success(
+        self,
+        authenticated_client: AsyncClient,
+        authenticated_user: User,
+        mock_socket_manager,
+    ):
         """Test sending message to specific user successfully."""
         target_user_id = 2
         message = "Hello there!"
@@ -72,7 +82,12 @@ class TestSocketEndpoints:
         )
 
     @pytest.mark.asyncio
-    async def test_send_message_to_user_not_connected(self, authenticated_client: AsyncClient, authenticated_user: User, mock_socket_manager):
+    async def test_send_message_to_user_not_connected(
+        self,
+        authenticated_client: AsyncClient,
+        authenticated_user: User,
+        mock_socket_manager,
+    ):
         """Test sending message to user who is not connected."""
         target_user_id = 999
         message = "Hello there!"
@@ -102,7 +117,12 @@ class TestSocketEndpoints:
         assert response.status_code == 401
 
     @pytest.mark.asyncio
-    async def test_broadcast_message_success(self, authenticated_client: AsyncClient, authenticated_user: User, mock_socket_manager):
+    async def test_broadcast_message_success(
+        self,
+        authenticated_client: AsyncClient,
+        authenticated_user: User,
+        mock_socket_manager,
+    ):
         """Test broadcasting message to all users successfully."""
         message = "Important announcement!"
 
@@ -137,7 +157,9 @@ class TestSocketEndpoints:
         assert response.status_code == 401
 
     @pytest.mark.asyncio
-    async def test_send_message_missing_parameters(self, authenticated_client: AsyncClient, authenticated_user: User):
+    async def test_send_message_missing_parameters(
+        self, authenticated_client: AsyncClient, authenticated_user: User
+    ):
         """Test sending message with missing parameters."""
         # Missing target_user_id
         response = await authenticated_client.post(
@@ -154,13 +176,17 @@ class TestSocketEndpoints:
         assert response.status_code == 422
 
     @pytest.mark.asyncio
-    async def test_broadcast_message_missing_parameters(self, authenticated_client: AsyncClient, authenticated_user: User):
+    async def test_broadcast_message_missing_parameters(
+        self, authenticated_client: AsyncClient, authenticated_user: User
+    ):
         """Test broadcasting message with missing parameters."""
         response = await authenticated_client.post("/api/v1/socket/broadcast")
         assert response.status_code == 422
 
     @pytest.mark.asyncio
-    async def test_send_message_invalid_user_id(self, authenticated_client: AsyncClient, authenticated_user: User):
+    async def test_send_message_invalid_user_id(
+        self, authenticated_client: AsyncClient, authenticated_user: User
+    ):
         """Test sending message with invalid user ID."""
         response = await authenticated_client.post(
             "/api/v1/socket/send-message",
@@ -169,10 +195,19 @@ class TestSocketEndpoints:
         assert response.status_code == 422
 
     @pytest.mark.asyncio
-    async def test_socket_status_shows_user_connection(self, authenticated_client: AsyncClient, authenticated_user: User, mock_socket_manager):
+    async def test_socket_status_shows_user_connection(
+        self,
+        authenticated_client: AsyncClient,
+        authenticated_user: User,
+        mock_socket_manager,
+    ):
         """Test that socket status correctly shows if user is connected."""
         # Test when user is connected
-        mock_socket_manager.get_connected_users.return_value = [str(authenticated_user.id), "2", "3"]
+        mock_socket_manager.get_connected_users.return_value = [
+            str(authenticated_user.id),
+            "2",
+            "3",
+        ]
 
         response = await authenticated_client.get("/api/v1/socket/status")
         data = response.json()